tthes tthes thtes httes thtes httes ttehs ttehs teths etths teths etths thets htets tehts ethts hetts ehtts thets htets tehts ethts hetts ehtts tthse tthse thtse httse thtse httse ttshe ttshe tsthe stthe tsthe stthe thste htste tshte sthte hstte shtte thste htste tshte sthte hstte shtte ttesh ttesh tetsh ettsh tetsh ettsh ttseh ttseh tsteh stteh tsteh stteh testh etsth tseth steth estth setth testh etsth tseth steth estth setth thest htest tehst ethst hetst ehtst thset htset tshet sthet hstet shtet tesht etsht tseht steht estht setht hestt ehstt hsett shett eshtt sehtt thest htest tehst ethst hetst ehtst thset htset tshet sthet hstet shtet tesht etsht tseht steht estht setht hestt ehstt hsett shett eshtt sehtt
Note: these 'words' (valid or invalid) are all the permutations of the word tthes. These words are obtained by scrambling the letters in tthes.